package com.yusys;

import com.yusys.domain.Student;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;
import java.util.List;

public class MyApp {
    public static void main(String[] args) throws IOException {
        // 访问mybatis读取student数据
        // 1.定义mybatis主配置文件的名称，从类路径的根开始
        String config = "mybatis.xml";
        // 2.读取这个config表示的文件
        InputStream in = Resources.getResourceAsStream(config);
        // 3.创建了SqlSessionFactoryBuilder对象
        SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
        // 4.创建SqlSessionFactory对象
        SqlSessionFactory factory = builder.build(in);
        // 5.【重要】获取SqlSession对象，从SqlSessionFactory中获取SqlSession
        SqlSession sqlSession = factory.openSession();
        // 6.【重要】指定要执行的sql语句的标识，sql映射文件中的namespace + "." + 标签的id值
        String sqlId = "com.yusys.dao.StudentDao" + "." + "selectStudent";
        // 7.执行sql语句，通过sqlId找到语句
        List<Student> studentList = sqlSession.selectList(sqlId);
        for (Student student : studentList) {
            System.out.println(student);
        }
        // 8.关闭SqlSession对象
        sqlSession.close();
    }
}
